Akio Sasaki(main character)  - red hair and blue eyes

Pronunciation: A-kee-o

Family tree: 

Daisuke Sasaki (father)

  Yami Sasaki( mother of Akio) (descended)

Osamu( half-brother) 

Minami( step-mother and Mother of Osamu)

Tekeshi-silver hair and black eyes

Status: demon Butler

  Pronunciation : Te-ke-shi

Lord Kazuhiko- black hair and red eyes

Status: Prince

  Pronunciation: Ka-zu-hi-ko

Son of Lord Makai
Mother: unknown (descended)

Lord Makai- black hair and red eyes
Status: One of the many seven demon lords

  Pronunciation: Ma-ka-i

Chikaze(younger): blonde hair and one blue eye and green eye

Twin to Hakuoh

  Pronunciation: Chi-ka-ze

Hakuoh: Blonde hair and one yellow eye and one blue eye

Twin to Chikaze

  Pronunciation : Hah-coo-oh